Younger. The opportunity cost of time scales non-linearly with age. If you're old enough, 10 years can be a life sentence.
If I were asked to give up 10 years of my life I would rather choose to give up the final 10 years than 10 years in the prime of my life.
If I were asked to give up 10 years of my life I would rather choose to give up the final 10 years than 10 years in the prime of my life.